Light gauge steel joist basic structure system of light partition wall and construction method therefor

ABSTRACT

A light gauge steel joist basic structure system of a light partition wall is disclosed, comprising: top and ground joists and vertical joists. The top and ground joists comprise a ground joist and a top joist. The vertical joist is provided between the top and ground joists by means of a first connection member. The vertical joist and the vertical joist are fixedly connected to each other by means of the first connection member and/or a second connection member. V-shaped slots are symmetrically provided on two side walls of the top and ground joists. The V-shaped slots are provided on the side walls and the bottoms of the vertical joists. A construction method for a light gauge steel joist basic structure of a light partition wall is also disclosed. The light gauge steel joist basic structure system is simple and fast to be constructed and has desirable flatness.

TECHNICAL FIELD

The present disclosure relates generally to wall structures, and more particularly, to a light gauge steel joist basic structure system of a light partition wall in a light partition wall system and a construction method thereof.

BACKGROUND

The various steel joists adopted by the existing light gauge steel joist partition wall system have following defects.

1. The construction is troublesome. In the traditional construction method, the overlapping jointing between the steel joists requires manual drilling and riveting connection which are both labor-consuming and time-consuming.

2. The construction precision is low. Instead of using any positioning, limiting tools or methods, the traditional construction method completely relies on the field control of the construction personnel, which results in a lot of human error risks, such as inaccuracy positioning of the steel joists, inaccuracy overlapping jointing position, and wrong overlapping jointing manner, and so on, thus deteriorating the overall accuracy of the steel joists.

3. The surfaces of the steel joist are not smooth. In the traditional construction method, the connecting nail head or fixing point projects for deforms, which results in the unsmooth surfaces of the steel joists. When the unsmooth steel joists are covered by plates, the finished surface should also have a poor smoothness.

The above problems are the key problems of the traditional light gauge steel joist system, which problems would cause the low construction efficiency of the light gauge steel joist system, uncontrollable construction quality and high requirements for the construction personnel, and so on.

SUMMARY

The object of the present application is to provide a light gauge steel joist basic structure system of a light partition wall in a light partition wall system and a construction method thereof, aiming at the above problems of the prior art.

In one aspect, a light gauge steel joist basic structure system of a light partition wall applicable in a light partition wall system is provided, which comprising a top and ground joist and a vertical joist both having a U-shaped groove and a same structure and size, wherein the U-shaped grooves of the top and ground joist and the vertical joist have a U-shaped flanging; wherein the top and ground joist comprises a ground joist fixedly connected to the ground and a top joist arranged above the ground joist, the vertical joist is installed between the ground joist and the top joist through a first connection member, while the vertical joists are fixedly connected to each other via the first connection member and/or a second connection member; V-shaped grooves are symmetrically provided on both side walls of the top and ground joist, while V-shaped grooves are provided on both side walls and bottom of the vertical joist.

In the light gauge steel joist basic structure system of a light partition wall according to one embodiment of the present application, the first connection member comprises a first connection portion connected to the vertical joist and a second connection portion connected to the top and ground joist, the first connection portion and the second connection portion are constructed as a whole; wherein the first connection portion comprises two first connection sheets respectively abutted against ends of the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the first connection sheet is respectively provided at its both sides with a first pressing sheet which is warped outwards to be clamped into the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the second connection portion comprises two second connection sheets respectively inserted into the U-shaped groove of the top and ground joist and abutted against side walls of the U-shaped groove of the vertical joist.

In the light gauge steel joist basic structure system of a light partition wall according to one embodiment of the present application, the second connection member comprises a square connection bottom plate provided respectively at its left and right sides with a left connection plate and a right connection plate extended vertically, as well as respectively at its upper and lower sides with an upper connection plate and a lower connection plate extended vertically; wherein the left connection plate, the right connection plate, the upper connection plate and the lower connection plate are connected in a circle to from a square groove together with the square connection bottom plate; wherein the square connection bottom plate is further provided with a fixation through hole and at least one oval groove projecting outwardly with a size matches that of the V-shaped groove of the vertical joist.

In the light gauge steel joist basic structure system of a light partition wall according to one embodiment of the present application, a cross-core joist penetrating through the U-shaped groove between the vertical joists is arranged between the top joist and the ground joist, while each vertical joist is provided with a convex hole matching the cross-core joist, wherein the cross-core joist is penetrated through the convex hole and is fixedly connected therewith.

In the light gauge steel joist basic structure system of a light partition wall according to one embodiment of the present application, each of the convex hole is provided with a third connection member which comprises a first clamping portion used to establish a fixed connection with the vertical joist, and a second clamping portion for clamping and fixing the cross-core joist; wherein the first clamping portion comprises a first clamping sheet extending outward vertically at both sides of the third connection member and clamping at the U-shaped groove of the vertical joist, and a second clamping sheet clamping into the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the second clamping sheet is arranged at both sides of the first clamping sheet, and the second clamping portion is a U-shaped notch matching with the cross-core joist.

In the light gauge steel joist basic structure system of a light partition wall according to one embodiment of the present application, the top and ground joist and the first connection member are fixedly connected via self-drilling screws; the vertical joist and the first connection member and/or the second connection member are fixedly connected via self-drilling screws; and the cross-core joist and the first connection member and/or the second connection member are fixedly connected via self-drilling screws; wherein the self-drilling screws are all drilled in from the V-shaped grooves and screw heads of the self-drilling screws are hidden in the V-shaped grooves.

In another aspect, a construction method for a light gauge steel joist basic structure system of a light partition wall comprising following steps:

S1. positioning a wall position of a light partition wall, comprising determining a wall position of the light partition wall on ground surface and drawing lines according to a deepening drawing;

S2. installing a ground joist;

S3. suspending lines and installing a top joist;

S4. installing a vertical joist which is vertically arranged, comprising fixedly connecting a first connection portion of a first connection member with ends of the vertical joist, and fixedly connecting a second connection portion of the first connection member into U-shaped groove of the ground joist or the top joist;

S5. installing a vertical joist which is transversely arranged, comprising fixedly connecting ends of the vertical joist which is transversely arranged to an opened side or a closed side of the vertical joist which is vertically arranged via the first connection member and/or a second connection member;

S6. installing a cross-core joist, comprising fixing and clamping a third connection member in a convex hole of the vertical joist, penetrating the cross-core joist through the vertical joist, and fixing and clamping the cross-core joist with the third connection member.

The present application has designed a complete a light gauge steel joist system comprising a top and ground joist, a vertical joist and a cross-core joist fixedly connected via a first connection member, a second connection member and a third connection member. The top and ground joist, the vertical joist and the cross-core joist have vertical and firm connections, and smooth surfaces. Moreover, the top and ground joist and the vertical joist are both provided with V-shaped grooves for enhancing the structural strength and for positioning and hiding screw heads of the self-drilling screws, such that a high construction precision as well as a design of comprehensively screw heads hiding are obtained, which enables the joist finish surface of the light gauge steel joist basic structure system of the light partition wall to have no protruding screw head or protruding point. In such a way, an automatic installation can be realized. Moreover, the installation surface of the cover plate of the joist structure is smooth, and the finish surface is also very smooth. The wall surface flatness of the light gauge steel joist basic structure system of the light partition wall can reach +2 mm, when it is covered by a cover plate, so the wallpaper can be directly laid, which makes the construction simple and fast.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a structure diagram of a light gauge steel joist basic structure system of a light partition wall according to one embodiment of the present application.

FIG. 2 is a structure diagram showing a connection between the top and ground joist and the vertical joist according to one embodiment of the present application.

FIG. 3 is a first structure diagram showing a first connection member according to one embodiment of the present application.

FIG. 4 is a second structure diagram showing a first connection member according to one embodiment of the present application.

FIG. 5 is a structure diagram showing a connection between the vertical joists according to one embodiment of the present application.

FIG. 6 is a structure diagram showing a second connection member according to one embodiment of the present application.

FIG. 7 is a structure diagram showing a connection between the vertical joist and the cross-core joist according to one embodiment of the present application.

FIG. 8 is a structure diagram showing a third connection member according to one embodiment of the present application.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

In order to illustrate the technical solution of the present application more clearly, the technical solution of the present application is further described in detail below in conjunction with the drawings and embodiments. Obviously, the following description is only some embodiments of the present application, and for those skilled in the art, other embodiments can be obtained based on these embodiments without requiring any inventive works.

Referring FIGS. 1-8, a light gauge steel joist basic structure system of a light partition wall applicable in a light partition wall system, especially applicable in various wall surface plates with a thickness between 10 mm-30 mm, is provided. The light gauge steel joist basic structure system of a light partition wall applicable in a light partition wall system comprises a top and ground joist and vertical joists 3, 4 and 5, all of which have a U-shaped groove 11 and a same structure and size. The U-shaped grooves 11 of the top and ground joist and the vertical joists 3, 4 and 5 have a U-shaped flanging 8, that is, the cross sections of the U-shaped grooves 11 of the top and ground joist and the vertical joists 3, 4 and 5 have the same size, such that when they are jointed together, the smoothness of the jointing surfaces can be guaranteed. The top and ground joist comprises a ground joist 1 fixedly connected to the ground and a top joist 2 arranged above the ground joist 1. After determining the position of the ground joist 1 according to the construction drawings, the ground joist lis fixed and installed at the designated position on the ground by gas gun nails or expansion bolts, and then the position of the top joist 2 is determined by suspending lines, after that the top joist 2 is fixed and installed at the designated position on the floor slab by gas gun nails or expansion bolts. The vertical joist 3 is arranged between the ground joist 1 and the top joist 2 through the first connection member 10 by the self-drilling screws 9. The vertical joists 3, 4 and 5 are fixedly connected with each other through the first connection member 10 and/or the second connection member 12 by the self-drilling screws 9. V-shaped grooves 7 are symmetrically provided on both side walls of the top and ground joist, while V-shaped grooves7 are provided on both side walls and bottom of the vertical joists 3, 4 and 5. The self-drilling screws 9 are all drilled in from the V-shaped grooves 7 and screw heads of the self-drilling screws 9 are hidden in the V-shaped grooves 7, which enables the surface of the light gauge steel joist basic structure system of a light partition wall to keep smooth, that is, all the V-shaped grooves 7 have a function of positioning and hiding the screw heads.

Specifically, the connection between the vertical joists includes following situations.

1. Transverse installation between two vertical joists 3 which are vertically arranged

At least one vertical joist 4 which is transversely arranged should be provided at the location of the light partition wall where should be opened for increasing the structural strength of the opened hole. In this case, the end of the vertical joist 4 which is transversely arranged is fixedly connected with an opened side or a closed side of the vertical joist 3. To be specific, the end of the vertical joist 4 which is transversely arranged is fixedly connected with an opened side of the vertical joist 3 which is vertically arranged via the first connection member, while the end of the vertical joist 4 which is transversely arranged is fixedly connected with a closed side of the vertical joist 3 which is vertically arranged via the second connection member.

2. Vertical installation between the top and ground joist and the vertical joist 4 which is transversely arranged

As the hole of the light partition wall normally should be equipped with various accessories, so the structure must be strengthened. Therefore, at least one vertical joist 5 is further added between the top and ground joist and the vertical joist 4 which is transversely arranged. The vertical joist 5 is vertically arranged and is fixedly connected to the top and ground joist via the first connection member 10. The vertical joist 5 and the vertical joist 4 which is transversely arranged are fixedly connected via the first connection member 10 or the second connection member 12 according to the installation orientation of the vertical joist 4 which is transversely arranged.

In a specific embodiment, the first connection member is used for the vertical connection installations between the top and ground joist and the vertical joist 3, and between the vertical joist 3 and the vertical joist 3 of the light gauge steel joist basic structure system of a light partition wall. In particular, both ends of the vertical joist 3 are arranged with one first connection member and via which the vertical joist 3 is fixedly connected to the top and ground joist to form the main frame of the light gauge steel joist basic structure system of the light partition wall. The first connection member 10 comprises a first connection portion connected to the vertical joist 3 and a second connection portion connected to the top and ground joist. The first connection portion and the second connection portion are fixedly connected to form a hollow rectangular block. The first connection portion comprises two first connection sheets 1001 respectively abutted against ends of the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3. The first connection sheet 1001 is respectively provided at its both sides with a first pressing sheet 1003 which is warped outwards to be clamped into the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3, wherein the second connection portion comprises two second connection sheets1002 respectively inserted into the U-shaped groove 11 of the top and ground joist and abutted against side walls of the U-shaped groove 11 of the top and ground joist. During the use, the first connection portion of the first connection member 10 is inserted into the end of the vertical joist 3, that is, the first pressing sheet 1003 is inserted into the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3 and clamped therein for clamping the first connection member 10 at the end of the vertical joist 3. Moreover, the end of the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3 abut against the end of the first connection sheet 1001 for positioning the first connection member 10 at the end of the vertical joist 3, and then the second connection portion of the first connection member 10 is inserted into the U-shaped groove 11 of the top and ground joist which abuts against the end of the vertical joist 3. The vertical joist 3 can implement a reciprocating movement along the U-shaped groove 11 of the top and ground joist via the first connection member 10 for adjusting its fixation location randomly. After the vertical joist 3 is positioned, the self-drilling screws are drilled into the second connection portion along the V-shaped groove 7 of the top and ground joist, that is, to form a fixation connection between the vertical joist 3 and the top and ground joist and finish the installation of the basic joists. The T-shaped vertical connection installation between the vertical joists 3 is similar as that between the vertical joist 3 and the top and ground joist, so is not described for concise.

The first pressing sheet 1003 is formed by stamping a part of the first connection sheet 1001, and the edge of the first pressing sheet 1003 is aligned with the edge of the first connection sheet 1001 to ensure that the end of the first connection member 10 is aligned with the end of the vertical joist 3. Preferably, the first pressing sheet 1003 is further provided with an arc-shaped bending structure 1004, through which the elastic force of the first pressing sheet 1003 is increased to better clamp the first connection member 10 to the end of the vertical joist 3.

Preferably, as the two first connection sheets 1001 have sheet-like structures, so they are liable to be unstable under force. Therefore, the two first connection sheets 1001 are fixedly connected via a first connection plate 1006 of a U-shaped structure for improving the structural stability of the first connecting portion. Preferably, the first connection sheet 1001 is provided with a first fixing sheet 1005 for pressing the first connection plate 1006 whose end is provided with a second fixing sheet 1010 at both sides of the pressing sheet. The first fixing sheet 1005 is bent to the first connection plate 1006 and abuts the same, while the second fixing sheet 1010 is bent to the first connection sheet 1001 and abuts the same, such that the first connection plate 1006 and the first connection sheet 1001 are fixedly connected with each other.

Preferably, in order to improve the structural strength of the second connection portion, the two second connection sheets 1002 are connected with each other through a second connection plate 1007 of an L-shaped structure. Specifically, the second connection plate 1007 can be formed by stamping and bending the same plate for forming the second connection sheet 1002. Of course, the second connection plate 1007 can also fixedly connected with the second connection sheet 1002 by a buckle or by a weld process. Preferably, in order to reduce the overall weight of the first connection member 10, there are two second connection plates 1007 with weight reducing hole 1008 arranged therebetween.

Preferably, the second connection sheet 1002 is provided with an arc protrusion 1009 for limiting and fixing the second connection plate 1007. Specifically, one arc protrusion 1009 is arranged on both sides of the second connection plate 1007, respectively. The arc protrusion 1009 is formed by directly stamping the second connection sheet 1002 to reduce the structure composition of the first connection member 10.

Preferably, the first connection plate 1006 is provided with a limit protrusion 1011 for defining the first connection sheet 1001 and the first connection plate 1006. The limit protrusion 1011 is arranged through the first connection sheet 1001 so as to fixedly connect the first connection sheet 1001 with the first connection plate 1006.

When in use, the first connection portion of the first connection member 10 is inserted into the end of the vertical joist 3, that is, the first pressing sheet is inserted into the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3 and clamped therein for clamping the first connection member 10 at the end of the vertical joist 3. Moreover, the end of the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3 abuts against the end of the first connection sheet for positioning the first connection member 10 at the end of the vertical joist 3, and then the second connection portion of the first connection member 10 is inserted into the U-shaped groove 11 of the top and ground joist which abuts against the end of the vertical joist 3. The vertical joist 3 can implement a reciprocating movement along the U-shaped groove 11 of the top and ground joist via the first connection member 10 for adjusting its fixation location randomly. After the vertical joist 3 is positioned, the self-drilling screws 9 are drilled into the first connection portion along the V-shaped groove 7 of the vertical joist 3 and into the second connection portion along the V-shaped groove 7 of the top and ground joist, that is, to form a fixation connection between the vertical joist 3 and the top and ground joist and finish the installation of the basic joists.

In a specific embodiment, the vertical joist 4 which is transversely arranged at the position where the light partition wall should be opened is fixedly installed on the closed side of the vertical joist 3 through the second connection member 12 which comprises a square connection bottom plate 1201 provided respectively at its left and right sides with a left connection plate 1202 and a right connection plate 1203 extended vertically, as well as respectively at its upper and lower sides with an upper connection plate 1204 and a lower connection plate 1205 extended vertically. The left connection plate 1202, the right connection plate 1203, the upper connection plate 1204 and the lower connection plate 1205 are connected in a circle to from a square groove together with the square connection bottom plate 1201. The square connection bottom plate 1201 is further provided with a fixation through hole and at least one oval groove 1213 projecting outwardly. In the present embodiment, two oval grooves 1213 with a size matches that of the V-shaped groove at the bottom of the vertical joist are provided, that is, the oval grooves 1213 can be embedded into the V-shaped groove at the bottom of the vertical joist for limiting the installation position of the connection members on the closed side of the vertical joist.

When installing the vertical joist 4 with the second connection member 12, the oval groove 1213 on the square connection bottom plate 1201 of the second connection member 12 is clamped into the V-shaped groove on the closed side of the first vertical joist 3 and the preset installation position is adjusted. Then the whole second connection member 12 is fixed at the preset connection position of the vertical joist 4 on the closed side of the vertical joist 3 by penetrating the self-drilling screws 9 through the fixation through hole on the square connection bottom plate 1201, then the vertical joist 4 and the second connection member 12 are fixedly connected by the self-drilling screws 9. In such a way, the vertical joist 4 is fixedly installed on the vertical joist 3. Preferably, the spacing between the left connection plate 1202 and the right connection plate 1203 matches the width of the U-shaped groove 11 of the vertical joist 4; and the spacing between the upper connection plate 1204 and the lower connection plate 1205 matches the height of the U-shaped groove 11 of the vertical joist 4. When installing, the second connection member 12 can be inserted directly into the U-shaped groove 11 of the vertical joist 4 and abut with the bottom surface and both sides of the U-shaped groove 11. After that, the lower connection plate 1205, the left connection plate 1202 and the right connection plate 1203 are fixedly connected to the bottom surface and both sides of the U-shaped groove 11 respectively by the self-drilling screws 9 for guaranteeing the compact performance and stability of the connection structure of the vertical joist 4 and vertical joist 3.

Preferably, since V-shape grooves 7 for positioning are arranged on three surfaces of the vertical joist 4 and the vertical joist 3, the lower connection plate 1205 is provided with an arc groove 1206 concaving towards the upper connection plate 1204. When the second connection member 12 is sleeved into the U-shaped groove 11 of the vertical joist 4, the V-shape grooves 7 of the vertical joist 4 matches with the arc groove 1206 of the lower connection plate 1205 for further limiting the installation position of the second connection member 12 and the vertical joist 4, which provides the installation accuracy of the vertical joist 4.

Preferably, when the second connection member 12 is fixedly connected with the vertical joist 4 and the self-drilling screw 9 is drilled into the arc groove 1206 of the lower connection plate 1205 from the V-shape grooves 7 of the vertical joist 4, sticking often happens. Accordingly, a rectangular groove 1207 can be arranged on the arc groove 1206 of the lower connection plate 1205 for limiting the fixation position of the self-drilling screw 9 for reducing the installation difficulty of the vertical joist 4. Preferably, a semi-circular notch 1208 is arranged at the abutting position between the square connection bottom plate 1201 and the arc groove 1206 for facilitating the pressing of the arc groove 1206.

Preferably, the installation accuracy of the vertical joist 4 is mainly the installation accuracy in the vertical direction. In order to facilitate the fine-tuning of the installation position in the vertical direction, the fixation through hole includes an upper through hole 1211, a lower through hole 1212, a left through hole 1210 and a right through hole 1209 arranged in a cross arrangement. The upper through hole 1211 and the lower through hole 1212 are waist-shaped holes which is capable of realizing the fine adjustment of the installation position of the vertical joist 4, reducing the installation difficulty of the vertical joist 4, and improving the installation precision of the vertical joist 4.

The second connection member 12 has a special usage. When the light gauge steel joist basic structure system of a light partition wall leans against the wall, one top and ground joist would be arranged on the corresponding wall. Both ends of the top and ground joist would be fixedly connected to the ground joist 1 and the top joist 2 via the second connection member 12, respectively, for solving the technical problems that the juncture gap between the light partition wall and the wall body would be broken easily due to the untight attachment between the vertical joist and the wall surface.

In a specific embodiment, although the light gauge steel joist basic structure system of a light partition wall has a vertical joist 5 which is transversely arranged to strengthen the structure, however the vertical joist 5 is mainly used to strengthen the structure of the vertical joist 4 while has no structure penetrating through the vertical joist 3. For this purpose, a cross-core joist 6 penetrating through the U-shaped groove 11 between the vertical joists 3 is arranged between the top joist and the ground joist, while each vertical joist 3 is provided with a convex hole matching the cross-core joist 6, wherein the cross-core joist 6 is penetrated through the convex hole and is fixedly connected therewith. Specifically, the size of the cross-core joist 6 is smaller than that of the vertical joist 3. The two sides and the bottom of the U-shaped groove 11 of the cross-core joist 6 all have a smooth and flat structure which facilitates the cross-core joist 6 to penetrate through the convex hole of the vertical joist 3, thus establishing a strengthened connection between all the vertical joists 3 for realizing the strengthening of the overall structure and ensuring the structure stability of the light gauge steel joist basic structure system of a light partition wall.

Preferably, each convex hole is provided with one third connection member 13, which comprises a first clamping portion used to establish a fixed connection with the vertical joist 3, and a second clamping portion for clamping and fixing the cross-core joist 6. The first clamping portion comprises a first clamping sheet 1301 extending outward vertically at both sides of the third connection member 13 and clamping at the U-shaped groove 11 of the vertical joist 3, and a second clamping sheet 1302 clamping into the U-shaped flanging 8 of the U-shaped groove 11 of the vertical joist 3. The second clamping sheet 1302 is arranged at both sides of the first clamping sheet 1301, and the second clamping portion is a U-shaped notch 1303 matching with the cross-core joist 6. Specifically, the first clamping portion has an arc-shaped structure, and the first clamping sheet 1301 is located at the highest point of the arc-shaped structure, while the two second clamping sheets 1302 are located at the two low points of the arc-shaped structure, thus forming a claw structure, such that the first clamping portion is clamped at the convex hole of the vertical joist 3. The U-shaped notch 1303 of the second clamping portion is arranged at its end for clamping and fixing the cross-core joist 6 on the second clamping portion.

In a specific embodiment, in order to reduce the difficulty of assembly and ensure the plane flatness of the joist structure of the light gauge steel joist basic structure system of a light partition wall, the top and ground joist and the first connection member 10 are fixedly connected via self-drilling screws 9; the vertical joist 3 and the first connection member 10 and/or the second connection member 12 are fixedly connected via self-drilling screws 9; and the cross-core joist 4 which is transversely arranged and the first connection member 10 and/or the second connection member 12 are fixedly connected via self-drilling screws 9. Moreover, the self-drilling screws 9 are all drilled in from the V-shaped grooves 7 and screw heads of the self-drilling screws 9 are hidden in the V-shaped grooves 7. When the V-shaped grooves 7 are used for drilling in the self-drilling screws 9 and hiding the position of the self-drilling screws 9, the assembly speed of the light gauge steel joist basic structure system of a light partition wall is greatly improved. The installation method of the above joists is briefly described as follows. The installation method of the basic joist is as follows. Firstly, the top and ground joist is installed. After the top and ground joist is positioned, the gas gun nails or expansion bolts can be used to fix it. Then the vertical joist 3 is installed by connecting it with the top and ground joist through the first connection member 10. The first connection member 10 is inserted into both ends of the vertical joist, and then the whole structure is inserted into the U-shaped groove 11 of the top and ground joist. The vertical joist 3 can slide along the U-shaped groove 11 of the top and ground joist through the first connection member 10, and its position can be adjusted arbitrarily. After the vertical joist 3 is positioned, the self-drilling screws are drilled in along the V-shaped groove 7 of the top and ground joist, that is, to form a connection between the vertical joist 3 and the top and ground joist and finish the installation of the basic joists.

The installation method of the vertical joist 4 which is transversely arranged is as follows. Firstly, the position of the opened hole is determined according to the construction drawings, and then the second connection member 12 is fixed on the vertical joist 3 at both sides of the opened hole with self-drilling screws 9. Then the vertical joist 4 on the upper end of the opened hole is installed, and the two ends of the vertical joist 4 are clamped into the second connection member 12, and the self-drilling screws 9 are drilled into the second connection member 12 along the V-shaped groove 7 of the vertical joist 4 on the upper end of the opened hole, that is, to form a firm connection between the vertical joist 3 and the vertical joist 4 at the opened hole, and complete the installation of the vertical joist 4.

The installation method of the vertical joist 5 for structure strengthening is as follows. The fixation connection plate and the vertical joist 5 for structure strengthening should be added at the opened hole of the wall and the plate joints. The vertical joist 5 can adopt the same structure as that of the vertical joist 3, that is, the vertical joist 3 can be used as the vertical joist 5 directly via connecting by the first connection member 10 or the second connection member 12. The fixing method is the same as above.

The installation method of the cross-core joist 6 (for whole strengthening). After the vertical joist 3 has been installed, the third connection member 13 is aligned with the convex hole (prefabricated) on the vertical joist 3 and clamped into the U-shaped groove 11 of the vertical joist 3 at both sides long the open end direction of the vertical joist 3. Then the U-shaped cross-core joist 6 is inserted into the convex hole on the vertical joist 3 for tightly matching with the third connection member 13. In such a way, the strength of the basic joist system should be strengthened. In addition, when the cross-core joist 6 is used alone, the dimension of the opening direction of the vertical joist 3 is the same as that of the non-opening direction, which ensures the consistency of the thickness of the wall after sealing the plate.

The present embodiment has further provided a construction method for a light gauge steel joist basic structure system of a light partition wall comprising following steps:

S1. positioning a wall position of a light partition wall, comprising determining a wall position of the light partition wall on ground surface and drawing lines according to a deepening drawing;

S2. installing a ground joist 1, comprising installing and fixing the ground joist 1 at the designated position on the ground by gas gun nails or expansion bolts;

S3. suspending lines and installing a top joist 2, comprising after the ground joist lis installed, determining the position of the top joist 2 by suspending lines, after that fixing and installing the top joist 2 at the designated position on the floor slab by gas gun nails or expansion bolts;

S4. installing vertical joists, comprising fixedly connecting a first connection portion of a first connection member 10 with ends of the vertical joist 3, and fixedly connecting a second connection portion of the first connection member 10 into U-shaped groove 11 of the ground joist 1 or the top joist 2;

S5. installing vertical joist 4 which is transversely arranged and the vertical joist 5 for structure strengthening, comprising fixedly connecting the vertical joist 4 and the vertical joist 5 on the vertical joist 3 via the first connection member 10 and the second connection member 12; normally, the vertical joist 5 is just arranged above the vertical joist 4 and fixedly connected with the vertical joist 4;

S6. installing a cross-core joist 6, comprising fixing and clamping a third connection member 13 in a convex hole of the vertical joist 3, and then penetrating the cross-core joist 6 through the convex hole of the vertical joist 3 and fixing and clamping the cross-core joist with the third connection member 13.

After completing the above six steps, the light gauge steel joist basic structure system of a light partition wall can be obtained, and then a first panel can be installed on such light gauge steel joist basic structure system. After that, the pipeline and cable box can be positioned and then installed. Finally, the second panel is installed above and opened with cable box holes, then the light partition wall can be obtained.

The present application has designed a complete a light gauge steel joist system comprising a top and ground joist, a vertical joist and a cross-core joist fixedly connected via a first connection member, a second connection member and a third connection member. The top and ground joist, the vertical joist and the cross-core joist have vertical and firm connections, and smooth surfaces. Moreover, the top and ground joist and the vertical joist are both provided with V-shaped grooves for enhancing the structural strength and for positioning and hiding screw heads of the self-drilling screws, such that a high construction precision as well as a design of comprehensively screw heads hiding are obtained, which enables the joist finish surface of the light gauge steel joist basic structure system of the light partition wall to have no protruding screw head or protruding point. In such a way, an automatic installation can be realized. Moreover, the installation surface of the cover plate of the joist structure is smooth, and the finish surface is also very smooth. The wall surface flatness of the light gauge steel joist basic structure system of the light partition wall can reach +2 mm, when it is covered by a cover plate, so the wallpaper can be directly laid, which makes the construction simple and fast.

The above-mentioned is only a preferred embodiment of the present application, and it should be pointed out that, for one skilled in the art, without departing from the principles of the present application, a number of improvements and embellishments can be made, which should also be considered as the scope of protection of the present application. 

What is claimed is:
 1. A light gauge steel joist basic structure system of a light partition wall applicable in a light partition wall system comprising a top and ground joist and a vertical joist both having a U-shaped groove and a same structure and size, wherein the U-shaped grooves of the top and ground joist and the vertical joist have a U-shaped flanging; wherein the top and ground joist comprises a ground joist fixedly connected to the ground and a top joist arranged above the ground joist, the vertical joist is installed between the ground joist and the top joist through a first connection member, while the vertical joists are fixedly connected to each other via the first connection member and/or a second connection member; V-shaped grooves are symmetrically provided on both side walls of the top and ground joist, while V-shaped grooves are provided on both side walls and bottom of the vertical joist; wherein the first connection member comprises a first connection portion connected to the vertical joist and a second connection portion connected to the top and ground joist, the first connection portion and the second connection portion are constructed as a whole; wherein the first connection portion comprises two first connection sheets respectively abutted against ends of the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the first connection sheet is respectively provided at its both sides with a first pressing sheet which is warped outwards to be clamped into the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the second connection portion comprises two second connection sheets respectively inserted into the U-shaped groove of the top and ground joist and abutted against side walls of the U-shaped groove of the vertical joist; wherein the second connection member comprises a square connection bottom plate provided respectively at its left and right sides with a left connection plate and a right connection plate extended vertically, as well as respectively at its upper and lower sides with an upper connection plate and a lower connection plate extended vertically; wherein the left connection plate, the right connection plate, the upper connection plate and the lower connection plate are connected in a circle to from a square groove together with the square connection bottom plate; wherein the square connection bottom plate is further provided with a fixation through hole and at least one oval groove projecting outwardly with a size matches that of the V-shaped groove of the vertical joist; wherein a cross-core joist penetrating through the U-shaped groove between the vertical joists is arranged between the top joist and the ground joist, while each vertical joist is provided with a convex hole matching the cross-core joist, wherein the cross-core joist is penetrated through the convex hole and is fixedly connected therewith.
 2. A light gauge steel joist basic structure system of a light partition wall applicable in a light partition wall system comprising a top and ground joist and a vertical joist both having a U-shaped groove and a same structure and size, wherein the U-shaped grooves of the top and ground joist and the vertical joist have a U-shaped flanging; wherein the top and ground joist comprises a ground joist fixedly connected to the ground and a top joist arranged above the ground joist, the vertical joist is installed between the ground joist and the top joist through a first connection member, while the vertical joists are fixedly connected to each other via the first connection member and/or a second connection member; V-shaped grooves are symmetrically provided on both side walls of the top and ground joist, while V-shaped grooves are provided on both side walls and bottom of the vertical joist.
 3. The light gauge steel joist basic structure system of a light partition wall according to claim 2, wherein the first connection member comprises a first connection portion connected to the vertical joist and a second connection portion connected to the top and ground joist, the first connection portion and the second connection portion are constructed as a whole; wherein the first connection portion comprises two first connection sheets respectively abutted against ends of the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the first connection sheet is respectively provided at its both sides with a first pressing sheet which is warped outwards to be clamped into the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the second connection portion comprises two second connection sheets respectively inserted into the U-shaped groove of the top and ground joist and abutted against side walls of the U-shaped groove of the vertical joist.
 4. The light gauge steel joist basic structure system of a light partition wall according to claim 2, wherein the second connection member comprises a square connection bottom plate provided respectively at its left and right sides with a left connection plate and a right connection plate extended vertically, as well as respectively at its upper and lower sides with an upper connection plate and a lower connection plate extended vertically; wherein the left connection plate, the right connection plate, the upper connection plate and the lower connection plate are connected in a circle to from a square groove together with the square connection bottom plate; wherein the square connection bottom plate is further provided with a fixation through hole and at least one oval groove projecting outwardly with a size matches that of the V-shaped groove of the vertical joist.
 5. The light gauge steel joist basic structure system of a light partition wall according to claim 2, wherein a cross-core joist penetrating through the U-shaped groove between the vertical joists is arranged between the top joist and the ground joist, while each vertical joist is provided with a convex hole matching the cross-core joist, wherein the cross-core joist is penetrated through the convex hole and is fixedly connected therewith; wherein each of the convex hole is provided with a third connection member which comprises a first clamping portion used to establish a fixed connection with the vertical joist, and a second clamping portion for clamping and fixing the cross-core joist; wherein the first clamping portion comprises a first clamping sheet extending outward vertically at both sides of the third connection member and clamping at the U-shaped groove of the vertical joist, and a second clamping sheet clamping into the U-shaped flanging of the U-shaped groove of the vertical joist, wherein the second clamping sheet is arranged at both sides of the first clamping sheet, and the second clamping portion is a U-shaped notch matching with the cross-core joist.
 6. The light gauge steel joist basic structure system of a light partition wall according to claim 2, wherein the top and ground joist and the first connection member are fixedly connected via self-drilling screws; the vertical joist and the first connection member and/or the second connection member are fixedly connected via self-drilling screws; and the cross-core joist and the first connection member and/or the second connection member are fixedly connected via self-drilling screws; wherein the self-drilling screws are all drilled in from the V-shaped grooves and screw heads of the self-drilling screws are hidden in the V-shaped grooves.
 7. A construction method for a light gauge steel joist basic structure system of a light partition wall comprising following steps: S1. positioning a wall position of a light partition wall, comprising determining a wall position of the light partition wall on ground surface and drawing lines according to a deepening drawing; S2. installing a ground joist; S3. suspending lines and installing a top joist; S4. installing a vertical joist which is vertically arranged, comprising fixedly connecting a first connection portion of a first connection member with ends of the vertical joist, and fixedly connecting a second connection portion of the first connection member into U-shaped groove of the ground joist or the top joist; S5. installing a vertical joist which is transversely arranged, comprising fixedly connecting ends of the vertical joist which is transversely arranged to an opened side or a closed side of the vertical joist which is vertically arranged via the first connection member and/or a second connection member; S6. installing a cross-core joist, comprising fixing and clamping a third connection member in a convex hole of the vertical joist, penetrating the cross-core joist through the vertical joist, and fixing and clamping the cross-core joist with the third connection member. 